Impacts on Water Consumption in Wet Flue Gas Desulfuration

Abstract:

Material balance calculation was adopted to a bubbling desulfurization system of 600MW unit for water-saving measures. Analysis was made on main factors affecting water consumption. Results showed that heat release of desulfurization reaction and water evaporation went up with sulfur content increasing; Free water and bound water in gypsum increased rapidly with calcium improved; When sulfur content enhanced from 0.5% to 3.5%, water evaporation of reactor increased by 28.9% and waste water increased by 7.8%; With inlet flue temperature of WFGD raised from 120°C to 200°C, waste water increased by 25.3% and evaporation of water increased by 102.35%; Once gas-gas heater (GGH) was installed, heat release of original flue gas decreased by 43.72% and the total water consumption decreased by 39.06%. Therefore, with sulfur content and temperature of inlet flue increasing, water consumption raises. Installation of gas-gas heater (GGH) can effectively reduce water consumption of WFGD system.

• Periodical: Advanced Materials Research (Volumes 986-987)
• Pages: 151-155
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.986-987.151
• Online since: July 2014
• Authors: Hai Ping Xiao*, Lin Dong, Gao Yan Han, Xiang Ning
• Keywords: Flue Gas Desulfurization System, Gas-Gas Heater, Water Balance, Water Consumption

References

[1] GAFFNEY J S, MARLEY N A. The impacts of combustion emissions on air quality and climate from coal to biofuels and beyond[J]. Atmosphere Environment, 2009, 43(1): 23-26.

DOI: 10.1016/j.atmosenv.2008.09.016

[2] LUO Yi. China Environment Statistical Yearbook[M]. BeiJing: China Environmental Science Press, (2011).

[3] SUN Keyin, ZHONG Qin. FGD system design construction and operation[M]. BeiJing: Chemical Industry Press, (2005).

[4] WANG Wenlong, MA Chunyuan, HU Mingqiang, etal. Study on utilization radio of desulfurizing agent based on composition analysis of by-products[J]. Journal of Power Engineering, 2009, 29(12): 1143-1147.

[5] NIE Pengfei, WANG Yang, WU Xuemin. Water consumption of wet FGD device for 600 MW units[J]. Thermal Power Generation, 2012, 41(10), 35-37.

[6] TONG Huiling, SUN Xuguang, LI Dingkai, etal. Comparison of water consumption between wet and semi-dry lime FGD processes[J]. Power System Engineering, 2003, 19(6): 1-3.

[7] LV Ming, ZHAO Zhijun, YIN Guoqiang, etal. Achieving water-saving purpose by reducing in-let gas temperatures in wet flue gas desulfurization process[J]. Journal of Chinese Society of Power Engineering, 2010, 30(9): 695-698.

[8] ZHOU Qulan, XU, Tongmo, HUI Shien. Development and application of China's own wet Flue Gas Desulfurization technique[J]. Journal of Power Engineering, 2006, 26(2), 261-264.

[9] CHEN Guojin. Research on technology of desulphurizing, dedusting and energy-saving of middle and small-sized coal fired boilers[J]. Journal of Power Engineering, 2003, 23(2): 2333-2337.

[10] YU Qinjian. Study of desulfurization system mass balance[D]. BeiJing, North China Electric Power University, (2013).

[11] LI Pengfei, TONG Huiling. Comparison and analysis on the calculation methods of acid dew point of flue gas[J]. Boiler Technology, 2009, 40(6): 5-8.

[12] ZENG Tinghua, YANG Hua, LISO Yongjin, etal. Wet FGD System commissioning, testing and operation[M]. BeiJing: China Electric Power Press, (2008).